测试一个网段主机在线情况，禁ping的情况除外

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for m in `seq 11 11`         do         for n in `seq 2 254`                 do                   ping -c 3 -W 3 192.168.$m.$n &>/dev/null                 if [ $? -eq 0 ];then                         echo 192.168.$m.$n is up                 else                         echo 192.168.$m.$n is down                 fi                   done           done wait